Patents by Inventor Mituhiko Serikawa

Mituhiko Serikawa has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Speaker system with image projection screen
    Patent number: 5025474
    Abstract: A speaker system has an acoustic diaphragm and an image projection screen provided on a surface of the diaphragm integrally therewith so as to enable the user to enjoy both realistic image on the screen and powerful sound reproduced through the diaphragm. The rear surface of the diaphragm is closed at a peripheral portion thereof while the central portion of the rear surface of the diaphragm is opened to the exterior, so that the speaker system can provide a high level of reproduced sound pressure in low-pitched region, while the thickness of the speaker is reduced remarkably. The diaphgram can be driven by a plurality of driving units so that the speaker system can operate only with an ordinary stereophonic amplifier.
    Type: Grant
    Filed: September 27, 1988
    Date of Patent: June 18, 1991
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Tsuneo Tanaka, Kazue Sato, Hiroyuki Takewa, Akira Kurozuka, Tadashi Tamura, Katsuji Hattori, Satoshi Takayama, Kosaku Murata, Katsuaki Satoh, Mituhiko Serikawa, Youichi Kimura, Shuichi Obata